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EP0768112A1 - Procédé et appareil pour produire de l'eau pure - Google Patents

Procédé et appareil pour produire de l'eau pure Download PDF

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Publication number
EP0768112A1
EP0768112A1 EP96810678A EP96810678A EP0768112A1 EP 0768112 A1 EP0768112 A1 EP 0768112A1 EP 96810678 A EP96810678 A EP 96810678A EP 96810678 A EP96810678 A EP 96810678A EP 0768112 A1 EP0768112 A1 EP 0768112A1
Authority
EP
European Patent Office
Prior art keywords
pure water
valve
line
pressure
membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96810678A
Other languages
German (de)
English (en)
Inventor
Philippe Rychen
Samuel Alonso
Thomas Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Christ AG
Original Assignee
Christ AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Christ AG filed Critical Christ AG
Publication of EP0768112A1 publication Critical patent/EP0768112A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/08—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/04—Backflushing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/06—Use of osmotic pressure, e.g. direct osmosis

Definitions

  • the present invention relates to a method for producing pure water by means of reverse osmosis, in which pure water is periodically flowed back through the membrane to clean the membrane, and to an apparatus for carrying out this method.
  • Reverse osmosis systems have been widely used in a wide variety of areas of water treatment, such as in the desalination of seawater or hard water, in the treatment of waste water or in the production of ultrapure water in the pharmaceutical and semiconductor industries.
  • salt-containing feed water is exposed to a static pressure and fed to a membrane module (membrane unit) with at least one semi-permeable membrane, a portion of which passes the membrane as pure water (permeate) under the driving force of the pressure difference and the remaining amount flows past the membrane and the membrane module leaves as a concentrate.
  • the static water pressure on the pure water side of the membrane is first increased by means of a temporary reduction or interruption of the pure water outflow at the membrane, and then, after the static water pressure has been adjusted on both sides of the membrane, the static water pressure on the feed water side of the membrane in suddenly reduced time intervals.
  • the pulse-like lowering of the static pressure on the feed water side causes a surge-like backflow of the pure water from the pure water side, which has the higher static pressure, to the feed water side, which is intended to free the membrane of impurities.
  • the feed water side is preferably temporarily supplied with pure water or a little saline water as feed water.
  • the invention therefore relates to a method for producing pure water by means of reverse osmosis, as defined in claim 1, and to an apparatus for carrying out this method, as defined in claim 17.
  • Preferred embodiments are described in dependent claims 2-16 and 18-26.
  • the optimal time intervals for pure water production and membrane cleaning can vary depending on the area of application, the device used and the physical and chemical composition of the feed water and can easily be determined from case to case.
  • the intervals for producing pure water for example, can typically be about one to several hours and the intervals for membrane cleaning can be about 5 to 30 minutes, and maintenance-free operation of up to one year can usually be achieved in this way.
  • the intervals for membrane cleaning ie the length of time during the pure water diffuses back through the membrane, at least about 5 minutes, preferably at least about 10 minutes, in order to effectively remove precipitates which were formed by exceeding the solubility product.
  • the intervals can also be much longer; However, cleaning intervals over 30 minutes generally do not result in any significant further improvement, which is why the cleaning time should usually not be more than 30 minutes for economic reasons.
  • the absolute value of the pure water yield is not critical to the invention. It can preferably be set by means of a control valve arranged in the concentrate discharge line, with which the pressure drop and thus the WCF value (water conversion factor) can be controlled.
  • Typical pure water yields are about 50-80% when treating hard water or about 70-95% when treating softened water.
  • a pure water tank connected via a connecting line to the pure water side is preferably provided, from which pure water can flow back to the pure water side and which is replenished during the production of pure water.
  • the clean water tank can be, for example, an open or closed storage tank, a flushing tank with a constant volume or a flushing tank made of flexible, non-stretchable material, which gradually slackens when pure water is dispensed, changing the volume / surface ratio, without a significant static pressure on the pure water exercise.
  • the water flowing back to the clean water side during cleaning of the membrane is essentially without pressure without special measures if the clean water tank is an open tank or a flushing tank made of a flexible, non-stretchable material.
  • a pure water reservoir from which pure water can be drawn via at least one tap connected to the pure water reservoir, is preferably also provided if a separate quantity is required for receiving and recycling the quantity of pure water required for cleaning the membrane Rinse tank is provided. If the pure water tank is an open tank, a pump is preferably arranged in the connecting line between the tank and the tap in order to transport the pure water to the tap under sufficient pressure.
  • the pure water reservoir can preferably be a closed reservoir in which pure water can be stored under pressure and which is connected to the pure water side of the membrane unit via a pure water line provided with a check valve.
  • pure water flows under pressure from the pure water side of the membrane unit via the pure water line into the storage tank. If the pressure on the pure water side of the membrane unit falls below the pressure in the pure water tank, the non-return valve closes, preventing pure water from flowing back from the tank during cleaning of the membrane.
  • a relief valve is preferably provided in the pure water line or in a branch line of the pure water line between the bypass line and the membrane module, which is opened during the cleaning of the membrane and closed during the production of pure water, and the throttle valve is preferably dimensioned such that during cleaning the membrane slightly higher amounts of pure water flow back through the throttle valve than diffuse back from the pure water side to the feed water side, the excess amount being able to flow out via the relief valve.
  • a rinsing tank with a relief valve can preferably be arranged in a branch line connected to the clean water line between the membrane unit and the check valve, the branch line between the rinsing tank and the pure water line preferably having a valve that closes when air is sucked in to avoid that Air enters the pipe system.
  • any closed memories familiar to the person skilled in the art are suitable for the preceding embodiments.
  • memories with one are preferred flexible membrane that divides the tank into a pure water chamber and a pressure chamber.
  • the water pressure in the pure water tank can preferably be measured by means of a pressure sensor arranged on the pure water tank or in the pure water line between the check valve and the pure water tank, and the shut-off valve can be switched such that the shut-off valve in the feed water line is closed when the measured pressure reaches a fixed upper one Value reached or the shut-off valve is opened when the measured pressure reaches a specified lower value.
  • the feed water side of the membrane unit can be rinsed with feed water before and / or after the cleaning of the membrane in order to remove impurities which have been deposited on the feed water side.
  • a check valve is preferably provided in the pure water line downstream immediately after the membrane unit.
  • the shut-off valve in the pure water line is closed and after a time interval sufficient for rinsing the feed water side, the shut-off valve in the feed water line is closed and the shut-off valve in the pure water line is opened again or, when the pressure measured by the pressure sensor reaches a specified lower value, (with the shut-off valve in the pure water line open) the shut-off valve in the feed water line is opened.
  • a high-pressure pump can also be arranged in the feed water line between the shut-off valve and the membrane unit.
  • the pump is preferably switched on with a time delay to open the shut-off valve.
  • the pump can also be preceded by a pressure switch which switches the pump off or prevents the pump from being switched on when the admission pressure is too low.
  • the pure water tank preferably has a level sensor for checking the amount of pure water present in the tank, the shut-off valve in the feed water line being closed when the amount of pure water reaches a predetermined upper value or the shut-off valve being opened when the amount of pure water reaches a predetermined lower value. It goes without saying that the pure water line should be connected to the storage tank below this lower level or should be immersed in the pure water to below this lower level in order to prevent air from entering the pure water line.
  • a high-pressure pump can be arranged in the feed water line between the shut-off valve and the membrane unit. Furthermore, if necessary, the feed water side of the membrane unit can be rinsed before and / or after the membrane has been cleaned. If, for example, a high-pressure pump is used but there is no flushing of the feed water side, the high-pressure pump is expediently switched on when the shut-off valve of the feed water line is opened, or switched off when the shut-off valve is closed.
  • FIGS. 1 to 4 each show a membrane unit (reverse osmosis membrane unit) 2 with at least one semipermeable membrane 1, which divides the membrane unit 2 into a feed water side (primary side) 7 and a pure water side (secondary side) 8.
  • Feed water is fed to the membrane unit 2 under pressure via a feed water line 3 connected to the feed water side 7 of the membrane unit 2, the feed water supply being able to be interrupted by closing a shut-off valve 6 arranged in the feed water line 3.
  • the pure water reservoir can be a closed reservoir 11, in which pure water can be stored under pressure, or - as shown in FIG. 4 - an open reservoir 25.
  • Any closed storage tanks of the type which are well known to the person skilled in the art are in principle suitable as closed pure water storage tanks 11.
  • the closed reservoir 11 can be designed as a "membrane pressure vessel" that is also familiar to the person skilled in the art, i.e. as a memory, which is divided by a flexible membrane 12 into a pure water chamber 13 and a pressure chamber 14.
  • a pump 29 in the connecting line between the reservoir 25 and the at least one tap in order to transport the pure water to the tap 9 under sufficient pressure.
  • a pump may be missing if the pure water can flow out of the reservoir 25 to lower tapping points 9.
  • the device shown in FIG. 1 has a rinsing tank 10 in a branch line 17 connected to the pure water line 5 between the membrane unit 2 and the check valve 20, which serves to hold the amount of pure water required for cleaning the semipermeable membrane 1 and from the pure water when the feed water supply is interrupted can diffuse back through the membrane 1 to the feed water side 7.
  • a portion of the pure water passing through the semipermeable membrane 1 flows into the rinsing container 10, where it is available for the next cleaning step stands, and the remaining amount flows into a pure water storage 11.
  • a relief valve 19 connected to the upper end of the washing container 10 directly or via a connecting line, with the control valve 18 open, pure water flows via the branch line 17 into the washing container 10.
  • the opening of the relief valve 19 and, if the control valve 18 is closed, the opening of the Control valve 18 take place simultaneously with the opening of the check valve 6.
  • the relief valve 19 is closed. Pure water now flows through the pure water line 5 into the pure water chamber 13 of the pure water reservoir 11, from where it flows to the recipient when the valve 9 is open.
  • the residual conductivity of the pure water can be monitored by means of a conductivity measuring probe 21, which is preferably on Pure water storage 11 or in the pure water line 5 between the check valve 20 and the pure water storage 11 is arranged. If valve 9 is closed, the pure water produced is stored in the pure water reservoir 11 until the pressure measured by pressure sensor 22 reaches a fixed upper value, which is lower than the pressure of the feed water supplied to the membrane unit 2, and then the pure water production is interrupted.
  • the feed water side 7 of the membrane unit 2 can first be cleaned of colloidal impurities.
  • a shut-off valve (not shown in FIG. 1) is preferably arranged in the pure water line 5 between the membrane unit 2 and the branch line 17, which is open during the pure water production and during the cleaning of the membrane and which is now closed to interrupt the pure water production.
  • a shut-off valve in the pure water line 5, is unnecessary if the pure water production is as long is maintained until the maximum possible pressure is reached, or if flushing of the feed water side 7 is dispensed with.
  • the shut-off valve 6 is closed and the relief valve 19 is opened. Any check valve arranged in the pure water line 5 becomes again open.
  • the feed water side 7 and the pure water side 8 of the membrane unit 2 and the rinsing container 10 are thereby released from the static pressure, the non-return valve 20 closing at the same time and thus maintaining the pressure in the pure water reservoir 11.
  • pure water now begins to diffuse back from the pure water side 8 through the semipermeable membrane 1 to the feed water side 7, pure water flowing in from the rinsing tank 10 to the pure water side 8 of the membrane unit 2.
  • a control valve 18 is arranged in the branch line 17 between the pure water line 5 and the rinsing tank 10, which closes as soon as air is sucked out of the rinsing tank 10, which also stops the back diffusion.
  • the back diffusion is stopped when the pressure in the pure water tank reaches the defined lower value and the shut-off valve 6 and a possibly closed control valve 18 are opened again, which starts a new cycle for the production of pure water.
  • a high-pressure pump 16 can in principle be dispensed with and the method can be carried out in the manner described above. If the device - as shown in FIG. 1 - has a high-pressure pump in the feed water line 3 between the shutoff valve 6 and the membrane unit 2, the method differs from the one described above only in that a shutoff valve in the pure water line 5 can be dispensed with and that High pressure pump 16 when the pure water production is interrupted switched off and switched on when opening or resuming the pure water production with a time delay to open the shut-off valve 6. A slight time delay before the high-pressure pump 16 is switched on is indicated in order to prevent the pump from cavitating as long as the required admission pressure is not present.
  • a pressure sensor can preferably be arranged in the feed water line between the shut-off valve 6 and the high-pressure pump 16, which switches the pump off or prevents the pump from being switched on when the pressure does not reach a predetermined lower value.
  • the device shown in FIG. 2 differs from the one shown in FIG. 1 essentially only in that the rinsing container 10 is arranged in the pure water line 5 and consists of a flexible but essentially non-stretchable material.
  • the pure water flows from the pure water side 8 of the membrane unit 2 via the pure water line 5 to the rinsing tank 10 and the pure water storage 11, from where it can flow to the consumer; the concentrate flows out via the concentrate drain line 4. If valve 9 is closed, the pure water produced is collected in the rinsing tank 10 and in the pure water tank 11, the amount of pure water stored in the rinsing tank 10 being limited by its capacity and the remaining amount flowing into the pure water tank 11.
  • the residual conductivity of the pure water can be monitored by means of a conductivity measuring probe 21, which is preferably arranged on the pure water reservoir 11 or in the pure water line 5 between the check valve 20 and the pure water reservoir 11.
  • the feed water side 7 of the membrane unit 2 can first be cleaned of colloidal impurities.
  • a shut-off valve (not shown in FIG. 2) is preferably arranged in the pure water line 5 between the membrane unit 2 and the flushing container 10, which is open during the pure water production and which is now closed to interrupt the pure water production.
  • the shut-off valve 6 is closed. Any check valve arranged in the pure water line 5 is opened again. By closing the check valve 6, the feed water side 7 is relieved of the static pressure. Since water is incompressible, a very small amount of pure water flowing back through the membrane 1 is sufficient to almost completely reduce the static pressure of the pure water between the pure water side 8 and the check valve 20 almost immediately.
  • a relief valve can be arranged on the flushing tank 10 or in the pure water line 5 between the membrane unit 2 and the check valve 20 (as shown in FIGS.
  • the back diffusion of pure water stops automatically when the concentrations on the feed water side 7 and the pure water side 8 are balanced or the amount of pure water stored in the rinsing container 10 is used up. Likewise, the back diffusion is stopped when the pressure in the pure water reservoir 11 reaches the defined lower value and the shutoff valve 6 is opened, with which the pure water production starts again.
  • a pressure sensor can preferably be provided in the feed water line between the shut-off valve 6 and the high pressure pump 16, which switches the pump off or prevents the pump from being switched on if the pressure does not reach a fixed lower value.
  • the residual conductivity of the pure water can be monitored by means of a conductivity measuring probe 21, which is preferably arranged on the pure water reservoir 11 or in the pure water line 5 between the check valve 20 and the pure water reservoir 11.
  • a conductivity measuring probe 21 which is preferably arranged on the pure water reservoir 11 or in the pure water line 5 between the check valve 20 and the pure water reservoir 11.
  • the feed water side 7 of the membrane unit 2 can first be cleaned of colloidal impurities.
  • the entire amount of feed water supplied to the membrane unit 2 now flows past the membrane 1 to the concentrate drain line 4 and flushes away any contaminants from the feed water side 7.
  • a shut-off valve in the pure water line 5 is not necessary if the pure water production is maintained until the maximum possible pure water pressure is reached or if the feed water side 7 is not rinsed.
  • the throttle valve 23 is expediently dimensioned such that the amount of pure water flowing back through the throttle valve 23 is slightly higher than the amount of pure water diffusing back through the semipermeable membrane 1, the excess amount is directed via branch line 17 into the drain.
  • the shut-off valve 6 is opened and the relief valve 19 is closed, which stops the back diffusion of pure water and starts a new cycle of pure water production. It goes without saying that the capacity of the pure water reservoir 11 and the distance between the lower and upper switching point of the pressure sensor 22 should be chosen to be large enough to ensure the back diffusion of a sufficient amount of pure water.
  • the high pressure pump 16 shown in FIG. 3 can be dispensed with and the method can be carried out in the manner described above if the feed water is available under sufficient pressure.
  • the method differs from the one described above only in that there is no need for a shut-off valve in the pure water line 5 and the high-pressure pump 16 is switched off when the pure water production is interrupted and with a delay in opening or restarting the pure water production for opening the shut-off valve 6 is switched on again.
  • the time-delayed switching on of the high-pressure pump 16 prevents the pump from cavitating as long as the required admission pressure is not present.
  • a pressure sensor can preferably be provided in the feed water line 3 between the shut-off valve 6 and the high-pressure pump 16, which switches the pump off or prevents the pump from being switched on if the pressure does not reach a defined lower value.
  • the shut-off valve 30 When the shut-off valve 30 is open, the pure water flows through the pure water line 5 into the pure water reservoir 25 and from there to the recipient; the concentrate flows out via the concentrate drain line 4.
  • the residual conductivity of the pure water can be monitored by means of a conductivity measuring probe 21 arranged on the pure water reservoir 25 or in the pure water line 5.
  • valve 9 When valve 9 is closed, the pure water produced is stored in the store 25 until the stored quantity of pure water reaches a fixed upper limit value corresponding to the upper switching point 28 of the level sensor 26, and then the pure water production is interrupted.
  • the feed water side 7 of the membrane unit 2 can first be cleaned of colloidal impurities (if desired, the feed water side 7 can also be rinsed after the membrane cleaning before resuming the pure water production).
  • shut-off valve 30 in the pure water line 5 is closed, whereby the Pure water production is interrupted and the entire amount of pure water supplied to the membrane unit 2 flows past the semipermeable membrane 1 to the concentrate drain line 4 and flushes away any impurities. If flushing of the feed water side 7 is dispensed with, the check valve 30 in the pure water line 5 is in principle unnecessary.
  • shut-off valve 6 in the feed water line 3 is closed and a shut-off valve 30 which may be present in the pure water line 5 is opened.
  • the feed water side 7 is relieved of the static pressure, and pure water begins to diffuse back under the influence of the osmotic pressure difference from the pure water side 8 through the semipermeable membrane 1 to the feed water side 7, pure water flowing from the pure water reservoir 25 via the pure water line 5 to the pure water side 8 of the membrane unit 2.
  • the high-pressure pump 16 shown in FIG. 4 can be dispensed with and the method can be carried out in the manner described above if the feed water is available under sufficient pressure.
  • the method differs from the one described above only in that the high-pressure pump 16 is switched off when the pure water production is interrupted and is switched on again with a time delay when the shut-off valve 6 is opened when the pure water production is started or resumed. Delayed switching on of the high-pressure pump 16 is recommended in order to avoid that the pump cavitates as long as the necessary admission pressure is not present.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP96810678A 1995-10-16 1996-10-10 Procédé et appareil pour produire de l'eau pure Withdrawn EP0768112A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH293195 1995-10-16
CH2931/95 1995-10-16

Publications (1)

Publication Number Publication Date
EP0768112A1 true EP0768112A1 (fr) 1997-04-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810678A Withdrawn EP0768112A1 (fr) 1995-10-16 1996-10-10 Procédé et appareil pour produire de l'eau pure

Country Status (2)

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EP (1) EP0768112A1 (fr)
HU (1) HUP9602832A3 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899238A1 (fr) * 1997-08-28 1999-03-03 Hager + Elsässer GmbH Procédé et appareil pour le traitement de l'eau par osmose inverse ou nanofiltration
DE19925397A1 (de) * 1999-06-02 2000-12-07 Bokela Ing Gmbh Verfahren und Vorrichtung zur Fest-Flüssig-Trennung
DE20302583U1 (de) * 2003-01-18 2003-06-12 W.E.T. Wasser-Energie-Technologie GmbH, 95359 Kasendorf Filtermembranrückspülung mit einem Druckbehälter
DE10164555A1 (de) * 2001-12-14 2003-06-26 Seitzschenk Filtersystems Gmbh Cross-Flow-Mikrofiltrationsanlage und Verfahren zum Betreiben einer Cross-Flow-Mikrofiltrationsanlage
RU2213061C1 (ru) * 2002-11-04 2003-09-27 Федеральное государственное унитарное предприятие "Исследовательский Центр им. М.В. Келдыша" Способ снижения энергетических затрат при опреснении морской воды
WO2004062774A3 (fr) * 2003-01-09 2004-09-30 Ide Technologies Ltd Nettoyage par osmose directe
WO2004024304A3 (fr) * 2002-09-13 2005-03-03 Pall Corp Systemes et procedes destines au nettoyage de membranes a fibres creuses
WO2005123232A3 (fr) * 2004-06-21 2006-02-02 Membrane Recovery Ltd Procede de nettoyage de membranes d'osmose inverse
WO2007073207A1 (fr) * 2005-12-22 2007-06-28 Statkraft Development As Procede et systeme permettant de realiser l'entretien d'une membrane servant a une osmose retardee par pression
NL1038485A (nl) * 2010-08-10 2012-07-03 Boekhoudt Een innovatieve milieuvriendelijke chemicalienvrije osmotische reinigingsproces voor het in bedrijf reinigen van swro- en bwro membranen.
DE102012012215A1 (de) * 2012-06-21 2013-12-24 Hydro-Elektrik Gmbh "Vorrichtung zur Abtrennung einer Komponente einer Lösung und Verfahren zum Betrieb der Vorrichtung"
CN103492054A (zh) * 2011-04-25 2014-01-01 东丽株式会社 膜组件的洗涤方法
WO2016066382A1 (fr) 2014-10-28 2016-05-06 Unilever N.V. Purificateur d'eau et procédé de nettoyage de membrane
CN110975633A (zh) * 2019-12-23 2020-04-10 中国科学院青岛生物能源与过程研究所 一种基于渗透压差的渗透膜清洗系统
WO2024086897A1 (fr) * 2022-10-27 2024-05-02 C2 Water (SPV) Pty Ltd Procédé de réduction d'accumulation d'encrassement sur des membranes d'osmose inverse et système de dessalement d'eau souterraine

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DE2101029A1 (en) * 1970-01-12 1971-07-22 Kroeyer, Karl Knstian Kobs, (Viby) (Danemark) Diluter/concentrator for solutions using - filtration
US3654148A (en) * 1970-09-28 1972-04-04 Puredesal Inc Liquid purification system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2101029A1 (en) * 1970-01-12 1971-07-22 Kroeyer, Karl Knstian Kobs, (Viby) (Danemark) Diluter/concentrator for solutions using - filtration
US3654148A (en) * 1970-09-28 1972-04-04 Puredesal Inc Liquid purification system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899238A1 (fr) * 1997-08-28 1999-03-03 Hager + Elsässer GmbH Procédé et appareil pour le traitement de l'eau par osmose inverse ou nanofiltration
DE19925397A1 (de) * 1999-06-02 2000-12-07 Bokela Ing Gmbh Verfahren und Vorrichtung zur Fest-Flüssig-Trennung
DE10164555A1 (de) * 2001-12-14 2003-06-26 Seitzschenk Filtersystems Gmbh Cross-Flow-Mikrofiltrationsanlage und Verfahren zum Betreiben einer Cross-Flow-Mikrofiltrationsanlage
WO2004024304A3 (fr) * 2002-09-13 2005-03-03 Pall Corp Systemes et procedes destines au nettoyage de membranes a fibres creuses
RU2213061C1 (ru) * 2002-11-04 2003-09-27 Федеральное государственное унитарное предприятие "Исследовательский Центр им. М.В. Келдыша" Способ снижения энергетических затрат при опреснении морской воды
ES2288388B1 (es) * 2003-01-09 2008-12-01 I.D.E. Technologies Ltd. Metodo de limpieza por osmosis directa.
WO2004062774A3 (fr) * 2003-01-09 2004-09-30 Ide Technologies Ltd Nettoyage par osmose directe
US7563375B2 (en) 2003-01-09 2009-07-21 I.D.E. Technologies Ltd. Direct osmosis cleaning
ES2288388A1 (es) * 2003-01-09 2008-01-01 I.D.E. Technologies Ltd. Limpieza por osmosis directa.
DE20302583U1 (de) * 2003-01-18 2003-06-12 W.E.T. Wasser-Energie-Technologie GmbH, 95359 Kasendorf Filtermembranrückspülung mit einem Druckbehälter
US7658852B2 (en) 2004-06-21 2010-02-09 Membrane Recovery Ltd RO membrane cleaning method
WO2005123232A3 (fr) * 2004-06-21 2006-02-02 Membrane Recovery Ltd Procede de nettoyage de membranes d'osmose inverse
AU2005254337B2 (en) * 2004-06-21 2010-04-15 Membrane Recovery Ltd Ro membrane cleaning method
US7972514B2 (en) 2005-12-22 2011-07-05 Statkraft Development As Method and a system for performing maintenance on a membrane used for pressure retarded osmosis
EA015391B1 (ru) * 2005-12-22 2011-08-30 Статкрафт Дивелопмент Ас Способ и система для осуществления технического обслуживания мембраны, используемой в методе ограниченного давлением осмоса
WO2007073207A1 (fr) * 2005-12-22 2007-06-28 Statkraft Development As Procede et systeme permettant de realiser l'entretien d'une membrane servant a une osmose retardee par pression
NL1038485A (nl) * 2010-08-10 2012-07-03 Boekhoudt Een innovatieve milieuvriendelijke chemicalienvrije osmotische reinigingsproces voor het in bedrijf reinigen van swro- en bwro membranen.
CN103492054B (zh) * 2011-04-25 2015-06-03 东丽株式会社 膜组件的洗涤方法
CN103492054A (zh) * 2011-04-25 2014-01-01 东丽株式会社 膜组件的洗涤方法
DE102012012215A1 (de) * 2012-06-21 2013-12-24 Hydro-Elektrik Gmbh "Vorrichtung zur Abtrennung einer Komponente einer Lösung und Verfahren zum Betrieb der Vorrichtung"
DE102012012215B4 (de) * 2012-06-21 2019-07-11 Hydro-Elektrik Gmbh Vorrichtung zur Abtrennung einer Komponente einer Lösung und Verfahren zum Betrieb der Vorrichtung
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WO2024086897A1 (fr) * 2022-10-27 2024-05-02 C2 Water (SPV) Pty Ltd Procédé de réduction d'accumulation d'encrassement sur des membranes d'osmose inverse et système de dessalement d'eau souterraine

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